JP2002016703A - Time, date and caller number display provided to speech party - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication network where a phone of a called party can display an originating number identifier and/or a data and/or a time in a day. SOLUTION: This invention provides a device and a method where an originating number identifier of a caller and/or a date and/or a time in a day at present are displayed on an incoming line identification device to which an analog phone service subscriber enters data. The originating telephone number of the caller subscriber can be obtained from a database in a phone exchange system that provides the POTS service to subscribers. The time in a day is obtained by a real time clock in the phone exchange system or by communication with the phone exchange system. Data are preferably transmitted to the device of the subscriber by the analog frequency shift keyed protocol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method and an apparatus for displaying information at a communication station. In particular, the present invention relates to an improvement on the analog central office display, wherein the display comprises calling number identification information and / or date and / or time of day information.

[0002]

2. Description of the Related Art A service that has become more widespread in recent years displays a caller's identification to a customer who has received a call.
In conventional analog telephones, this service, called called incoming call line identification (ICLID) or caller ID, is implemented over the public switched telephone network (PSTN) by a party calling during the first two rings. PS to identify
Provided by an auxiliary display on the called party's telephone device that receives information from the TN and uses the received information to display the number of the calling party. The problem with the prior art is that, for analog lines, ICLIDs are
While providing information about the incoming call, or while the customer is idle or busy, the ICLID does not provide any important information about the outgoing call from the communications network to assist the calling customer. That is.

[0003] US Patent No. 5,6 by Demlow et al.
08,788 discloses a partial solution to this problem. Regarding the display of information provided to the calling party,
The patent states on the calling telephone: (1) the name of the called customer, (2) the motto, slogan, advertisement or cost message from the called customer, (3) an automatic call back, or Information that gives the calling party additional options, such as a call to leave a voice message, (4) information from the central office reporting conditions such as overload, (5) a central office switching system and / or
Or displaying many types of information, including service identification marks from interchange carriers. While this information is useful, Demlow does not disclose additional information that is probably even more useful to the calling party.

[0004]

Under various circumstances, the calling party's telephone device has an originating number of the calling telephone line.
Preferably, a bar identifier (ONI or simply a telephone number) is provided. For example, the calling party may have a specific terminating number (terminating number identifier (t
emitting number identifier
i.) or want to determine if the call directed to TNI) is a toll call from the calling party's telephone line. Such a decision can be made if the ONI of the call is known. In a further example, in a calling arrangement where the fare charging depends on the ONI-TNI, the calling party requires the ONI to calculate the fare charging for a particular TNI. In a further example, the calling party's telephone device may be installed with general least cost routing (LCR) software that can determine and perform the cheapest route for a particular telephone call. LCR decisions typically require that the telephone device possesses both ONI and TNI information. In a further example, in situations where the calling party wishes to instruct the called party to verbally instruct the calling party to call the calling party's ONI, The party must know its ONI in order to be able to provide that information. In other situations, the calling party may connect its telephone device to its telephone line, for example, to a modem operably connected to a computer. The calling party device in such a situation may have the telephone line ONI to determine which of the multiple available service access numbers is appropriate for the ONI calling area. is necessary. For example, if the device is a computer with a modem and the service to be accessed is an Internet connection, based on the ONI, the computer determines the appropriate local access TNI for the Internet service from a database in the computer. Is also good. For these and other reasons, what is needed is a method for obtaining the calling number identifier from the public telephone network for the calling party (or the calling party's telephone device).

[0005] Even in various situations, it is desirable that the PSTN be supplied with the current date and time during the day from the telephone device of the calling party. For example, some LCR decisions may be based on a fee structure that depends on the time of the day and / or the day of the week. Prior art LCR relies on time of day and day of week from native clock / calendar functions in the LCR device, and obtaining date and time information directly from the PSTN is: Provides a high degree of accuracy in LCR determination. More generally, the date and time of day information provided in requests in a simple and easily accessible form from trusted sources provide a significant advantage to telephone subscribers in many ways. Available in sex. This information obtained from the PSTN can be used to program various devices and operations depending on the date and / or time, as well as devices associated with communication over the telephone line, as well as through the telephone subscriber's home or office. , Applied. For these and other reasons, the calling party (or simply the telephone subscriber)
All you need is a date and / or 1
Getting time in the day.

[0006]

According to the principles of the present invention,
Prior to or during when the calling party is dialing or when the called customer is alerted (ie, when the called phone is ringing), and to a properly equipped station Specific data supplied from or via the central office after the call has been established,
By providing the calling customer, an advance is made over the prior art in a communication network having a switching system that handles the calling customer. The particular data to which the present invention relates are the calling telephone number and / or the time and / or date of the current day. Depending on the situation, this information supplied to the calling customer may come from a database shared by a plurality of central office switching systems, from a database of a central office switching system connected to the customer, or from a switching system real time clock. . This information is currently employed to help establish a call, such as a CCS7 network, and is accessible using a signaling network that sends the calling number to the called customer regarding the ICLID. The information is provided in response to a signal, such as a management signal or a series of signals carrying a dialed number.

In accordance with one particular embodiment of the present invention, the device used to display information to the calling party was previously used only to display a number to enter into the called party. Such additional information is to the calling party, as indicated by Demolow. Demolo
As in w, in this embodiment, the calling customer may be alerted when the station is idle or off-hook, but before receiving an audible tone, or when the called party is alerted. A frequency shift keyed (FSK) for controlling the ICLID display either during a burst of audible tones (audible tones are an obstruction of FSK signaling) or when the central office is busy. Receive the signal.

In accordance with this embodiment, a calling number identifier and / or
Or, the date and / or time of day can be displayed on the calling phone.

[0009]

FIG. 1 is a structural block diagram showing the operation of the present invention. Exchange system (switch) 101
Is 5ESS. RTM. In particular, July 1985 /
AT & T Technical Journal Vol. 64, N
o. 6, Part 2, pp. 1305-1564, and manufactured by AT & T are Bec.
It has the ability to switch both voice and data, as described in US Patent No. 4,592,048 to Kner et al. This switch is, for example, a telephone office 15
Used to handle Integrated Services Digital Network (ISDN) central offices, such as 0, to which the present invention is not directed. The ISDN central office set 150 has a handset 151 and a display 152. This station set includes the CCITT Red Book Volume III. 5 CCITT ISDN Basic Rate Interface (B
RI) and CCITT Red Book Volume VI. 9 Recommendation Q. 931. 93
It has the ability to handle one interface. This switch is equipped to handle the set of stations handled via the basic rate interface (BRI) 162 or, as indicated by the central office 125, these set of stations handled via the main rate interface (PRI) 126. You.

Although this description is directed in detail to switches that may be applied to handle ISDN stations, those skilled in the art will recognize that if only analog telephones are handled by a particular switch, the present invention is addressed. Even if the central office switching system cannot handle ISDN stations, ICL
It can be performed for those phones equipped with ID devices.

In any case, the present invention provides an ISDN
Since it is not directed to a telephone but to an analog telephone, this description assumes that the switching system, in this case,
It is further relevant to the present invention that it also has the ability to handle regular analog telephones, such as central office 124, equipped with an incoming call line identification (ICLID) device 127 via analog line 172. Further, the switching system includes a database control 11 having a domain database 120 and an optional database real time clock 119.
Data link 117 acting as a peripheral control device such as 8
Can also support. The switching system 101 can also support a data link 133 that accesses the switching system via the CCS7 network 132, which interfaces with the switching system 141 that handles the station set 146 and the area database 142. Exchange system 101
And 141 are public switched telephone networks (PSTNs), which are considered to include between the local exchange and the switching network.
They are interconnected via 150.

The switch 101 has a processor 110 for controlling the switch. Processor 110, in order,
The central processing unit 108 includes a call control program 106 for controlling the operation of the central processing unit, and call data 107. The switch also includes a local database system 116, and 931 equipped station lines connected to the system such as customer line 162,
(2) an interconnected network 132; (3) a data link such as 133, such as a data link connected to the system; (4) data about a database control 118 connected to the system via a data link 117. , Accumulate data like. The CPU 108 controls a transaction recorder 113, such as a magnetic tape unit, that records billing information relating to services provided in accordance with Applicants' invention. The CPU 108 includes a switch 1 that includes a billing record function performed by the transaction recorder 118.
A real time clock 109 is provided that provides time of day and / or date data for various data processing functions associated with 01. The CPU 108 also has access to a local database system 116 that supplies data to be displayed at the central office connected to the switching system 101 or supplies data in response to requests received from the CSS7 network 132 via the data link 133. I do. The switch transmits data between the processor 110 and the database control 118 and from the data link 133 to the CSS7 network 132 and to the customer line 172
There is also a voice and data exchange network 112 that can be used to transmit voice and data between data links entering the system, such as a customer line such as.
The CSS7 network 132, which has one or more networks,
Used to access 01. Voice and data exchange network 112 is connected to control unit 110 via control connection 111. Voice and data exchange network 112 is further connected to database control 118 via data link 117.

The changes required in the switching system to carry out the invention are the processor 1 of the switch for performing the tasks described in the flow charts of FIGS.
10 is the addition of the program. Depending on the circumstances, the information provided to the calling customer may be from a local database 116 or from a database shared by multiple central office switching systems, such as a regional database 120, from a database real time clock 119, or directly from the system. It will be appreciated that it comes from the real time clock 109. Database control 118 and area database 1
20 obtains data regarding the calling or called terminal and / or the called station set when the data is either requested by the local database system 116 or initiated by the database control 118 itself. Used for Database real-time clock 119 or system real-time clock 109, when started by database control 118, is used to obtain time and / or date data during the day.

In the ISDN application, which is not relevant to the present invention, the service request is that when the calling party picks up the handset 151, the ISDN station set 1
50 to the switching system 101 via the BRI line 162. Send a 931 SETUP message. In analog applications, when the calling party's central office 124 goes "on-hook", the office equipment changes the impedance on the analog line 172, which is served by the network 112, as known to those skilled in the art. Treated as a request. In each case, the service request is detected by the voice and data exchange network 112 and is routed via the control connection 111 to the call control 106 in the processor 110. Call control 106 sends a calling party identification and line status inquiry message 122 to data base control 118 via data link 117. Database control 118 queries domain database 120 via data link 117. For an embodiment of the present invention that provides the ONI to the calling party, data message 1
The configuration of 22 has the information obtained from this question. In embodiments of the present invention that provide the calling party with the time and / or date of the day, the composition of the data message 122 may be obtained from either the database real time clock 119 or the real time clock 109. Information. Data message 122 is sent to data link 117 for transmission to call control 106 via control connection 111.
Via the voice and data exchange network.

In an alternative embodiment, the database control 1
18 initiates a line status inquiry message 122 without any request being received first. In addition, the database control 118 may again construct the data message 122 with the date from the real-time clock 109 or 119 and / or time of day information without a request for a service request. Thus, the data message 122 including the ONI and / or date and / or time of day may be configured by the database control 118 while the analog station 124 is idle.

In one embodiment of the present invention, call control 106
Can periodically send data messages 122 to the ICLID device 127 for display while the analog station 124 is idle (on-hook). In another embodiment, call control 106 may display an IC for display after completion of the dial (to avoid interference with the dial tone signal).
A data message 122 can be sent to the LID device 127. Such data can be returned to the ICLID device after completion of the dialing and before returning to the party where the audible ringing occurs, or during a burst of audible tones. Alternatively, this data can be sent prior to the return dial tone. In each case, since the ICLID device is connected to an analog line, require in-band signaling to avoid collisions or interference between frequency shift keyed signals (1200 and 2200 Hz) and dial tone or audible tone signals. Is desirable.

The outline of the information processing to be displayed to the ICLID device 127 is as follows. The data message 122 is a question message requesting information from the database system 120 and / or the database real time clock 119 or the system real time clock 109. is there. The query data message 122 may be issued from the database control 118 in response to a service request. Instead, the database control 118 may use the query data message 122 itself.
May be started. The interrogation data message may include the date and / or time of day, calling number, line status, and the number called, and the number called should be returned to the caller of that number. Used to identify the response. Message 122 is also a response message and has data obtained in response to the question.
With respect to the present invention, the prior art discloses a query data message 1 sent within a telephone network to process a query.
22 discloses that the calling number ONI may be included, but for analog telephones, the response message 122 recently transmitted to the ICLID device 127 in response to the query may include the calling number ONI or the calling number ONI. Nowhere disclosed is the inclusion of a time and / or date of the day.

FIG. 2-5 shows a flow chart of the method of one embodiment of the present invention. These figures show the calling party's analog telephone set 124, the ICILID device 127,
The operation of the information display service configuration including the exchange system 101 and the database control 118 will be described. Calls handled according to the principles of the present invention are information display calls. Other calls refer to the usual conventions for calls. "
Usually handled by "call processing".

Conventional circuits used to transmit data from a switch to an ICLID device are described in US Pat. R. Doug
hty in U.S. Patent No. 4,551,581. This conventional circuit may transmit data in the absence of a ring signal, or transmit data during bursts of audible tones or during other caller off-hook or on-hook conditions, or transmit data messages. Can be changed in a straightforward way, such as cutting off the audible tone during. Data messages to be transmitted before the caller dials are transmitted before the dial tone is given.

FIG. 2 shows an ICLID prior to dialing.
The display 127 (FIG. 1) is described and begins at the point where the station set is idle (action block 202). When the calling party requests service (goes off-hook), the service request message arrives at the switching system, which sends it to call control to process it (action block 204). If the information display handling is proper (test 206), the access format is checked for proper ICLID display (test 20).
8). Any test (test 206 or 208)
If falls, the call undergoes normal call handling (action block 210). If both tests (tests 206 and 208) pass, call control sends the customer identification and service request information to the database control (action block 212). Database control 118 (FIG. 1)
Is the appropriate information data message (in the case of the present invention,
ONI data and / or date and / or time of day), and send this message to call control 10.
6 (FIG. 1) (action block 214). Call control sends the message using FSK data transmission (action block 216), marks the call record (action block 218), and returns to normal call processing (action block 210).

In transmitting messages to the ICLID device 127 (FIG. 1), collisions between the frequency shift keyed signal and the dial tone or audible tone signal must be avoided, as described above. The Analog Display Service Interface (ADSI) described in TA-1273 issued by Bellcore
Allow SK signaling to be provided off-hook,
The system mutes the station receiver when the FSK carrier signal is being transmitted, so that the party associated with the receiver does not hear the large burst tones when FSK data is being transmitted. However, such systems cannot be used to signal when a caller is dialing, since at least one of the dial tone multi-frequency (DTMF) signals interferes with the FSK signal. Thus, some embodiments of the present invention transmit a message to the station before transmitting a dial tone indicating that the station is going off-hook, but a digit is to be dialed.

Referring to FIG. 3a, the idle station 302 goes off-hook 304 and issues 306 a service request to call control for processing. Steps 307 to 308
Indicates the call control activity indicated by steps 204 to 216 in FIG. After the call control has transmitted the data using FSK data transmission 308, the dial tone is sent to the customer equipment and normal call processing is enabled 310 under call control.

In another embodiment, after dialing is completed, a signal is sent to the calling station when detected by the switching system. Referring to FIG. 3b, an embodiment is shown in which the message of the present invention is sent immediately after dialing is completed before the call is connected and connected. The station goes off hook 312 generating a service request to call control for processing. In response, call control returns to dial tone and enables 314 digit collection. Call control collects 316 the dialed digits and performs 318 digit analysis. Upon determining 320 that the complete number has been dialed, call control asks a query and (FIG. 2)
322 get the message as in 212 and 214. Call control uses FSK data transmission 324 to send messages as data. The call control then returns to normal call processing at 326.

In yet another embodiment described above, the FSK data according to the present invention may be transmitted after the call processing is completed, wherein an apparatus such as disclosed by Doughty, Sent from the system to the station "
It may be received between a "ringing tone" and a "busy tone".

Other signaling arrangements where the caller provides data during off-hook are also used, and some of these arrangements use lower power levels to transmit digital information, thereby making the caller The caller's ear does not receive an excessively loud signal. Voice signaling Hearing data transmission known in the prior art can provide a convenient way of signaling to an analog station at essentially any time (other than during a call).

FIG. 4 shows the I for the on-hook message.
The process begins with the database control 118 (FIG. 1) which initiates a request to send a message by showing the CLID indication 127 (FIG. 1) and sending address information and a data message to the call control to the call control (action block 402). The data message is generated without receiving a request from the station. The data message is sent to the system real time clock 109 (FIG. 1) or the database real time clock 1
19 (FIG. 1) as a result of a change in the date and / or time information during the day. Alternatively, the data messages may be generated periodically or simply in time, according to programs in switching system 101, by means known to those skilled in the art. The terms "off-hook" and "on-hook" as used herein generally refer to an activated or inactive management state of a communication terminal. In the present invention, the message is the ONI and / or date and / or 1
Contains time information during the day. Some messages are queued for the caller and these can be transmitted sequentially prior to providing a dial tone. Call control receives the data message and address information and initiates message delivery (action block 40).
4). If the call control does not detect address error information (test 406), the call control sends the data using FSK data transmission (action block 414) and marks the call record (action block 416), and the session Ends (action block 412). If the call process detects call address error information (test 406), call control sends this information to the database control process (action block 408). The database control then updates the domain database system and ends the session (action block 41).
0).

FIG. 5 shows an IC shown by Demolow.
1 shows a conventional state diagram of an LID device 127. FIG. The conventional circuit is C.I. R. U.S. Patent No. 4,5 by Doughty
82,956. Prior art circuits are controlled according to the first four states of the state diagram of FIG. First, the connected central office goes on-hook, and
The circuit is idle (state 0) and goes to state 1 when a ringing tone is detected. The circuit then goes to state 2 when silence is detected. From state 2, when a frequency shift key (FSK) carrier signal is detected, the ICLID circuit goes to state 3, and in state 3, the FSK signal is detected and sent to the display control system. If the carrier is no longer detected, I
The CLID circuit returns to state 2. If a transition from on-hook to off-hook is detected in any of states 1, 2, or 3, the ICLID circuit returns to idle state 0.

In order to achieve the object of the present invention, Deml
As described at ow, three additional states (states 4-6) are added to the ICLID control. If the ICLID circuit is in the idle state (state 0) and a transition from on-hook to off-hook is detected, the ICLID circuit enters a new state 4. During state 4, if an FSK carrier is detected, the ICLID circuit will switch to a new state 5
Then, in the new state 5, the FSK message transmitted to the display control is detected. In state 5, the calling station's earphone is deactivated, thereby
The caller cannot hear the FSK signal. If no carrier is detected, the ICLID circuit returns to state 4. In either state 4 or state 5, if the telephone device goes from off-hook to on-hook, the ICL
The ID circuit returns to the idle state 0. In addition, state 5
Or if a response signal is recognized during state 4, IC
The LID circuit returns to idle state 0. (At this point, the message is maintained until the subscriber goes on-hook, and during state 0, the transition from off-hook to on-hook is ignored in this embodiment). The response signal is recognized by the switching system 101 to start charging for the call.
The response signal to the ICLID device during state 5 may be a particular short FSK message from either the switch 101 or the terminating switching system 141. State 4
The transition from to state 0 is also achieved by a simple timeout. In addition, if an FSK carrier is detected during on-hook or off-hook (state 0, idle), the ICLID circuit goes to state 6 for receiving a data message. If there are no more FSK carriers, the ICLID circuit returns to idle (state 0).

As used herein, "display" may be visually static (text or graphic), visually dynamic, audible, or (for use by blind users).
It may be tactile and may be one or more media (eg, audible and visual). Thus, instead of sending information about the visual display, the process can concatenate the information as an audio message, as a video message, as data, or as another type of out-of-band signaling message.

The display itself can be controlled by a processor having a memory in the terminal, which can display the selected and possibly modified, stored or generated result according to the data received. Further, the display device may simply be a receiving device operatively connected to the device for further processing and / or displaying the message data sent according to the invention at the station.

Although the present invention has been described with some particularity, those skilled in the art should recognize that those components may be changed without departing from the scope of the invention. Thus, the present invention is not limited to the specific forms described herein, but rather covers such alternatives, modifications and equivalents as may be reasonably included within the scope of the present invention. I do. The invention is limited only by the claims and their equivalents.

[0032]

According to the present invention, the calling number identifier and / or
Alternatively, a communication network can be provided in which the date and / or time of day can be displayed on the calling telephone.

[Brief description of the drawings]

FIG. 1 is a block diagram of a communication network for processing customer information according to the method of FIGS.

FIG. 2 is a flow diagram of various methods for processing a call and transmitting data to an ICLID device of an off-hook station of a calling party in accordance with the present invention.

FIG. 3A is a flow diagram of various methods for processing a call and transmitting data to an ICLID device of an off-hook station of a calling party in accordance with the present invention.

FIG. 3B is a flow diagram of various methods for processing a call and transmitting data to an ICLID device of an off-hook station of a calling party in accordance with the present invention.

FIG. 4 shows the ICLI when the station is idle (on-hook)
FIG. 3 is a flow diagram of a method for transmitting data to a D device according to the present invention.

FIG. 5 is a state diagram of an ICLID device implementing the present invention.

[Explanation of symbols]

 101 Switching System (Switch) 106 Call Control 107 Call Data 108 Central Processing Unit 109 System Real Time Clock 110 Processor 111 Control Connection 112 Voice and Data Exchange Network 113 Transaction Recorder 116 Local Database System 117 Data Link 118 Database Control 119 Database Real Time Clock 120 Area Database 122 Data Message 124 Telephone Office 126 Main Rate Interface (PRI) 127 Call Line Identification (ICLID) Device 132 CSS7 Network 133 Data Link 141 Switching System 142 Area Database 150 Telephone Office 151 Handset 152 Display 162 Basic Rate Interface (BRI) 172 analog line

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 11/00 302 H04M 11/00 302 F-term (Reference) 5K024 AA71 CC03 DD01 FF04 GG01 GG05 HH01 5K036 DD33 DD48 EE01 JJ04 JJ13 5K101 KK16 LL01 MM07 NN01 NN14 NN18 NN21

Claims (15)

[Claims] 1. A communication network for providing data to a set of stations, comprising: a switching system; a set of stations handled by the switching system; means for storing a plurality of data messages accessible by the switching system; Operating in response to a request from the switching system, for automatically obtaining from the storage means a particular data message selected from the group consisting of a calling number identifier, a time of day, and a date. And a means for automatically transmitting said particular data message to said set of stations. 2. A communication network for providing data to a set of stations according to claim 1, wherein said means for storing comprises a real-time clock in a switching system. 3. The communication network for providing data to a set of stations according to claim 1, wherein said means for storing comprises a real-time clock accessible by a plurality of switching systems. 4. The communication network for providing data to a station set according to claim 1, further comprising means for displaying said particular data message at said station set. 5. The communication network for providing data to a station set according to claim 4, wherein said displaying means comprises an input line identification (ICLID) device connected to said station set. 6. The communication network for providing data to a station set according to claim 5, wherein said transmitting means transmits a frequency shift key (FSK) data message. 7. In a communication network having a switching system and at least one station set served by the switching system, a method for providing a particular one of a plurality of data messages available in the system to the station set comprises the steps of: Selecting a specific data message from a group consisting of a calling number identifier, a time of the day, and a date from a group; starting transmission of a specific data message to a station set; identifying to a station set Transmitting the data message. 8. The method of claim 7, further comprising the step of displaying a particular message at a station in a communication network having a switching system and at least one set of stations handled by the switching system. 9. In a communication network having a switching system and at least one set of stations handled by the switching system, the step of initiating transmission of a particular data message to the set of stations is performed while the set of stations is on-hook. 9. The method of claim 7, wherein the method is performed. 10. In a communication network having a switching system and at least one station set served by the switching system, the step of displaying a particular message at the station set is performed while the station set is on-hook. The method described in. 11. In a communication network having a switching system and at least one set of stations served by the switching system, the step of initiating transmission of a particular data message starts after the station goes off-hook. The method described in. 12. In a communication network having a switching system and at least one station set handled by the switching system, dialing back to and dialing a station after performing the step of transmitting a particular data message to the station set. The method of claim 11, further comprising collecting digits. 13. In a communication network having a switching system and at least one set of stations handled by the switching system, the step of initiating transmission of a particular data message includes the step of going off-hook by the station and completing the dialing sequence. 8. The method according to claim 7, which starts later. 14. In a communication network having a switching system and at least one set of stations handled by the switching system, said step of transmitting a particular data message is performed during a ringing tone sent to a station by the switching system. 14. The method of claim 13, wherein the method is performed. 15. In a communication network having a switching system and at least one set of stations handled by the switching system, the step of transmitting a particular data message is performed during a busy tone sent to the station by the switching system. 14. The method of claim 13, wherein the method is performed.